PT-2026-39865 · Outline · Outline

Pyuysig · Published 2026-05-11 · Updated 2026-05-15 · CVE-2026-44695

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Outline versions prior to 1.7.1

Description The Slack integration callback for the endpoint "/auth/slack.post" accepts an unsigned, session-independent OAuth state value. This allows a third party with a Slack OAuth code for the same Outline Slack client to trick a logged-in user into completing the callback. Consequently, the user's Outline account is linked to the attacker's team id and user id. The attacker can then utilize the Slack "/outline" search command while impersonating the victim Outline user.

Recommendations Update to version 1.7.1.

Exploit

Fix

CSRF

Weakness Enumeration

CWE-352

Related Identifiers

CVE-2026-44695

Affected Products

Outline

References · 5

• 🔥 https://github.com/outline/outline/security/advisories/GHSA-mjgw-5j7q-gv8v · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-44695 · Security Note
• https://t.me/cveNotify/163676 · Telegram Post
• https://t.me/CVEtracker/53424 · Telegram Post
• https://twitter.com/VulmonFeeds/status/2053982191294488620 · Twitter Post