CVE-2026-44695

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.

CVSS v3.1 Score

5.8

MEDIUM

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

EPSS — Exploit Prediction

0.0002

Probability of exploitation

0.04%

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-352 Cross-Site Request Forgery

Affected Products

Vendor	Product	Versions
getoutline	outline	< 1.7.1

References

Advisories & Patches

https://github.com/outline/outline/security/advisories/GHSA-mjgw-5j7q-gv8v https://github.com/outline/outline/security/advisories/GHSA-mjgw-5j7q-gv8v

Exploits

https://github.com/outline/outline/security/advisories/GHSA-mjgw-5j7q-gv8v https://github.com/outline/outline/security/advisories/GHSA-mjgw-5j7q-gv8v

Frequently Asked Questions

What is CVE-2026-44695? +

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. It has a CVSS v3.1 base score of 5.8 (MEDIUM).

How severe is CVE-2026-44695? +

CVE-2026-44695 has a CVSS v3.1 score of 5.8 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0002, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-44695? +

CVE-2026-44695 affects products from getoutline, specifically: outline. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-44695? +

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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