CVE-2026-41243: openlearn Access Control Flaw — Exploit

Description

OpenLearn is open-source educational forum software. Prior to commit 844b2a40a69d0c4911580fe501923f0b391313ab, when `safeMode` is enabled, unapproved forum posts are hidden from the public list, but the direct post-read procedure still returns the full post to anyone with the post UUID. Commit 844b2a40a69d0c4911580fe501923f0b391313ab fixes the issue.

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CVSS v3.1 Score

5.4

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

EPSS — Exploit Prediction

0.0003

Probability of exploitation

0.09%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-284 CWE-284

Affected Products

Vendor	Product	Versions
siemvk	openlearn	< 2026-04-14

References

Advisories & Patches

https://github.com/siemvk/OpenLearn/commit/844b2a40a69d0c4911580fe501923f0b391313ab https://github.com/siemvk/OpenLearn/security/advisories/GHSA-4rv3-hfh6-vqvm https://github.com/siemvk/OpenLearn/security/advisories/GHSA-4rv3-hfh6-vqvm

Exploits

https://github.com/siemvk/OpenLearn/security/advisories/GHSA-4rv3-hfh6-vqvm https://github.com/siemvk/OpenLearn/security/advisories/GHSA-4rv3-hfh6-vqvm

Frequently Asked Questions

What is CVE-2026-41243? +

OpenLearn is open-source educational forum software. Prior to commit 844b2a40a69d0c4911580fe501923f0b391313ab, when `safeMode` is enabled, unapproved forum posts are hidden from the public list, but the direct post-read procedure still returns the full post to anyone with the post UUID. Commit 844b2a40a69d0c4911580fe501923f0b391313ab fixes the issue. It has a CVSS v3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2026-41243? +

CVE-2026-41243 has a CVSS v3.1 score of 5.4 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0003, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-41243? +

CVE-2026-41243 affects products from siemvk, specifically: openlearn. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-41243? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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