CVE-2026-40300
Last modified
CVE-2026-40300 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Zulip is an open-source team collaboration tool. Prior to 12.0, With message_edit_history_visibility_policy set to "moves", /api/v1/messages/{id}/history still returns historical content values, allowing low-privilege users to recover text that was edited away from other users' messages. EPSS estimates a 0.25% chance of exploitation in the next 30 days.
Description
Zulip is an open-source team collaboration tool. Prior to 12.0, With message_edit_history_visibility_policy set to "moves", /api/v1/messages/{id}/history still returns historical content values, allowing low-privilege users to recover text that was edited away from other users' messages. This vulnerability is fixed in 12.0.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Zulip | Zulip Server | 10.0 |
References
- https://github.com/zulip/zulip/security/advisories/GHSA-jp8f-mvv6-89crExploit, Vendor Advisory
- https://github.com/zulip/zulip/security/advisories/GHSA-jp8f-mvv6-89crExploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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