CVE-2026-115474: Auth Bypass (CVSS 6.5)

Description

Zulip is an open-source team collaboration tool. From 8.0 until 12.2, in organizations where the Who can view all other users in the organization setting restricted guests from viewing other users, saving or editing a direct message draft did not verify that the sender could access the draft recipients. A guest could thereby gain access to otherwise restricted users' profile information without sending a message. Organizations that did not restrict guest access were unaffected. This issue is fixed in version 12.2.

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CVSS v3.1 Score

6.5

MEDIUM

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

EPSS — Exploit Prediction

0.0033

Probability of exploitation

0.27%

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-862 Missing Authorization

References

Other References

https://github.com/zulip/zulip/commit/1127d4cd3cc17a3cc38435ce57ed52b083c33f97 https://github.com/zulip/zulip/commit/83a4a3a966e6eef11914b80f04426ae114a1970d https://github.com/zulip/zulip/pull/39913 https://github.com/zulip/zulip/releases/tag/12.2 https://github.com/zulip/zulip/security/advisories/GHSA-vwqp-7j32-xfg5 https://zulip.readthedocs.io/en/latest/overview/changelog.html#zulip-server-12-2

Frequently Asked Questions

What is CVE-2026-115474? +

Zulip is an open-source team collaboration tool. From 8.0 until 12.2, in organizations where the Who can view all other users in the organization setting restricted guests from viewing other users, saving or editing a direct message draft did not verify that the sender could access the draft recipients. A guest could thereby gain access to otherwise restricted users' profile information without sending a message. Organizations that did not restrict guest access were unaffected. This issue is fixed in version 12.2. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-115474? +

CVE-2026-115474 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0033, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-115474? +

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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