CVE-2026-44695

medium

Published 2026-05-11 · Modified 2026-05-15

CVSS v3

6.5

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

CVSS v2

—

VIR risk

6.5

Description

Outline is a service that allows for collaborative documentation. Prior to 1.7.1, the Slack integration callback for GET /auth/slack.post accepts an unsigned, session-independent OAuth state value. A third party who can obtain a Slack OAuth code for the same Outline Slack client can make a logged-in Outline user complete the callback and link that user's Outline account to the attacker's Slack team_id and user_id. The linked Slack identity can then use the Slack /outline search command as the victim Outline user. This vulnerability is fixed in 1.7.1.

Predictions

Exploit likelihood

75%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: security-advisories@github.com — https://github.com/outline/outline/security/advisories/GHSA-mjgw-5j7q-gv8v

Application impact

Vendor	Product	Versions	Fixed
getoutline	outline	`{"endExcluding":"1.7.1"}`	`1.7.1`

References

CWEs

CWE-352

Verify integrity in audit chain (admin only). AS-IS.