The Central Board of Secondary Education (CBSE) on Tuesday evening strongly rejected a social media claim alleging that its On-Screen Marking (OSM) system had been compromised. The allegation, circulated by a user online, stated that the CBSE OSM portal bearing the URL cbse.onmarks.co.in was hacked on February 26, 2026. The post later formed the basis of multiple media reports.
In a detailed clarification posted on X, the Board said the portal used for the actual evaluation of answer scripts operates on a separate URL, which remains secure and has not been compromised in any manner.
"In a post made by a user on social media, it has been claimed that the CBSE On Screen Marking (OSM) bearing URL: cbse.onmarks.co.in was compromised by him on 26.02.2026. This has also formed the basis for a few news articles. At the outset, it is clarified that the Portal used for evaluation of answer-books bore a different URL, which has neither been compromised nor does it have the vulnerabilities indicated in the said social media post," the Board stated.
CBSE further clarified that the URL cbse.onmarks.co.in is only a testing site containing sample data used strictly for internal testing and review purposes, and does not contain any real examination-related information.
"The URL: cbse.onmarks.co.in is the testing site only with sample data for internal testing and review purposes. There are no actual evaluation data, marks or other data held on that portal," it added.
The Board also categorically stated that no security breach has been detected in the actual On-Screen Marking platform used for evaluation of answer scripts."The Board emphasises that no security breaches have come to light on the Portal deployed for the actual evaluation work," it stated.
Clarification Regarding Claim of Compromise of CBSE OSM Portal
— CBSE HQ (@cbseindia29) May 26, 2026
In a post made by a user on social media, it has been claimed that the CBSE On Screen Marking (OSM) bearing URL: https://t.co/lwAeAFWwo1 was compromised by him on 26.02.2026. This has also formed the basis for a few…
CBSE further said that the On-Screen Marking system has been introduced to enhance transparency in the evaluation process, supported by robust grievance redressal mechanisms. It added that strong technical safeguards are in place to ensure the integrity, security, and reliability of the operational system used for official assessment.
The clarification comes amid ongoing online discussions around alleged vulnerabilities in digital examination and evaluation systems.
