The Central Board of Secondary Education’s (CBSE) opened its re-evaluation portal on Tuesday, but it was targeted by a “barrage of cyberattacks”, including as many as 1.5 million hits on the portal within 2 minutes in an attempt to disrupt services and deny students access to the platform. Besides, more than 1 lakh attempts were made for unauthorised file access. The CBSE opened the Verification of Marks and Re-evaluation Portal on Tuesday, allowing students who received scanned copies of their answer sheets to apply online for verification and re-evaluation of their marks.&nbsp;&nbsp;Thousands of students submitted their applications amid the controversy over the On-Screen Marking (OSM) process used to evaluate Class 12 students.&nbsp;In a post on X, the CBSE said that the re-evaluation portal is currently supporting over 8,000 concurrent users and that more than 16,000 students had completed their submissions for re-evaluation as of 3 pm.“While thousands of students accessed the CBSE re-evaluation portal today, malicious actors attempted to disrupt services through a barrage of cyberattacks. Most recent being a denial of service attack attempt causing 1.5 million hits on the portal within a matter of 2 minutes and more than 1 lakh attempts of unauthorised file access,” it said.&nbsp;&nbsp;

<blockquote class="twitter-tweet">Update from our Cybersecurity Teams: The CBSE revaluation portal is currently supporting over 8,000 concurrent users. As of 3:00 PM today, more than 16,000 students have successfully completed their submissions. While thousands of students accessed the CBSE re-evaluation portal…&mdash; CBSE HQ (@cbseindia29) <a href="https://x.com/cbseindia29/status/2061756348325577125?ref_src=twsrc%5Etfw">June 2, 2026</a></blockquote> <script async src="https://platform.x.com/widgets.js" charset="utf-8"></script>

&nbsp;&nbsp;<h2>‘Teams vigilant and responsive to ensure services’</h2>&nbsp;&nbsp;Board officials said technical teams are monitoring the portal round-the-clock and responding to any issues as they arise.“Our teams remain vigilant and responsive to ensure students are able to access services without disruption,” the board said in the post on X.&nbsp;The portal remained functional in spite of the massive cyberattacks and continued to process student applications.&nbsp;The board further assured that several changes have been introduced based on feedback from students to refine the process and make it more convenient and seamless. These include extending session time limits to make the application process smoother and reduce the risk of sessions expiring before applications are submitted.&nbsp;The board’s re-evaluation application process will remain open until June 6, 2026.&nbsp;The development comes amid continuing scrutiny of CBSE’s On-Screen Marking (OSM) system after students and evaluators reported technical glitches and delays in post-result services, including the re-evaluation process.&nbsp;CBSE had previously maintained that the portal would be launched to ensure a transparent and seamless mechanism for students seeking verification of marks and re-evaluation.

The portal remained functional in spite of the massive cyberattacks and continued to process student applications. The board also said that several changes have been introduced based on feedback from students to refine the process and make it more convenient and seamless.

The Central Board of Secondary Education’s (CBSE) opened its re-evaluation portal on Tuesday, but it was targeted by a “barrage of cyberattacks”, including as many as 1.5 million hits on the portal within 2 minutes in an attempt to disrupt services and deny students access to the platform. Besides, more than 1 lakh attempts were made for unauthorised file access. The CBSE opened the Verification of Marks and Re-evaluation Portal on Tuesday, allowing students who received scanned copies of their answer sheets to apply online for verification and re-evaluation of their marks. Thousands of students submitted their applications amid the controversy over the On-Screen Marking (OSM) process used to evaluate Class 12 students. In a post on X, the CBSE said that the re-evaluation portal is currently supporting over 8,000 concurrent users and that more than 16,000 students had completed their submissions for re-evaluation as of 3 pm. “While thousands of students accessed the CBSE re-evaluation portal today, malicious actors attempted to disrupt services through a barrage of cyberattacks. Most recent being a denial of service attack attempt causing 1.5 million hits on the portal within a matter of 2 minutes and more than 1 lakh attempts of unauthorised file access,” it said.

The portal remained functional in spite of the massive cyberattacks and continued to process student applications. The board also said that several changes have been introduced based on feedback from students to refine the process and make it more convenient and seamless.

‘1.5mn hits in 2 minutes, 1 lakh file access attempts’: CBSE re-evaluation portal faces massive cyberattack

Amid ongoing controversy over the On-Screen Marking, the Central Board of Secondary Education (CBSE) on Sunday (May 31) admitted vulnerabilities in the digital platform used for evaluating Class 12 answer sheets. However, the CBSE claimed earlier that the issues highlighted were linked to an incorrect URL and a testing portal, and not a security breach. In a post on X, CBSE stated that they are actively monitoring vulnerabilities detected in the OSM portal operated by its service provider after concerns were raised in the public domain. The acknowledgement comes amid growing scrutiny of the board's On-Screen Marking (OSM) system, with students reporting issues, cybersecurity researchers highlighting possible security gaps, and questions emerging over the tendering process through which the contract was awarded.

<blockquote class="twitter-tweet">We have been closely monitoring the vulnerabilities in the OnMark portal of our service provider that are being flagged in the public domain. An expert team of cybersecurity professionals has been deployed over the last few days from across various arms of the government as well…&mdash; CBSE HQ (@cbseindia29) <a href="https://x.com/cbseindia29/status/2060998766384300195?ref_src=twsrc%5Etfw">May 31, 2026</a></blockquote> <script async src="https://platform.x.com/widgets.js" charset="utf-8"></script>

In its official statement, CBSE said a team of cybersecurity experts drawn from various government agencies and the Indian Institutes of Technology has been working in recent days to reinforce the platform’s security framework. The board said the vulnerabilities identified so far have been addressed, while additional efforts are being made to detect and eliminate any remaining security risks. It also noted that the portal is being migrated to a more secure environment as part of broader measures aimed at enhancing system security.&nbsp;Also read: <a href="https://www.wionews.com/india-news/general-ns-raja-subramani-takes-charge-as-cds-admiral-krishna-swaminathan-assumes-office-as-navy-chief-1780233493002">General NS Raja Subramani takes charge as CDS, Admiral Krishna Swaminathan assumes office as Navy Chief</a><h3>CBSE appreciates ethical hackers</h3>The board express gratitude to vigilant citizens and ethical hackers who flagged potential security vulnerabilities, stating that their inputs have been valuable in strengthening the system. CBSE said it has already contacted some of these individuals directly and lauded their efforts in helping improve the system's security. The board has also encouraged anyone who may have identified security flaws or vulnerabilities to share their findings with its security team at secy-cbse@nic.in. The statement comes amid ongoing scrutiny of the OnMark portal and concerns regarding its security framework, with CBSE maintaining that necessary corrective measures are being implemented to protect the system.

CBSE has acknowledged vulnerabilities in its On-Screen Marking (OSM) portal used for evaluating Class 12 answer sheets. The board said identified flaws have been fixed, security measures strengthened, and the platform is being migrated to a safer environment. 

Amid ongoing controversy over the On-Screen Marking, the Central Board of Secondary Education (CBSE) on Sunday (May 31) admitted vulnerabilities in the digital platform used for evaluating Class 12 answer sheets. However, the CBSE claimed earlier that the issues highlighted were linked to an incorrect URL and a testing portal, and not a security breach. In a post on X, CBSE stated that they are actively monitoring vulnerabilities detected in the OSM portal operated by its service provider after concerns were raised in the public domain. The acknowledgement comes amid growing scrutiny of the board's On-Screen Marking (OSM) system, with students reporting issues, cybersecurity researchers highlighting possible security gaps, and questions emerging over the tendering process through which the contract was awarded.

CBSE has acknowledged vulnerabilities in its On-Screen Marking (OSM) portal used for evaluating Class 12 answer sheets. The board said identified flaws have been fixed, security measures strengthened, and the platform is being migrated to a safer environment.&nbsp;

CBSE admits security vulnerabilities in class 12 digital evaluation portal hacked twice

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‘1.5mn hits in 2 minutes, 1 lakh file access attempts’: CBSE re-evaluation portal faces massive cyberattack

CBSE admits security vulnerabilities in class 12 evaluation portal hacked twice