---
title: "CVE-2026-77261: MCP Atlassian - Server Side Request Forgery"
description: "MCP Atlassian < 0.22.0 contains a server side request forgery caused by omission of _make_ssrf_safe_hook in JiraFetcher and ConfluenceFetcher sessions, letting attackers follow redirects to internal addresses without revalidation, exploit requires attacker-controlled or compromised Atlassian instance."
url: https://panop.io/threat-heartbeat/CVE-2026-77261/
---

# CVE-2026-77261 MCP Atlassian - Server Side Request Forgery

MCP Atlassian < 0.22.0 contains a server side request forgery caused by omission of \_make\_ssrf\_safe\_hook in JiraFetcher and ConfluenceFetcher sessions, letting attackers follow redirects to internal addresses without revalidation, exploit requires attacker-controlled or compromised Atlassian instance.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

Proof of concept available

EPSS

0.32% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-77261)

## Details

Type

Server Side Request Forgery

Impact

Server Side Request Forgery

CVSS vector

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

Published

22 September 2026

Updated

15 October 2026

Weakness

[CWE-918](https://cwe.mitre.org/data/definitions/918.html)

## Vendor fix

Update to version 0.22.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-77261](https://nvd.nist.gov/vuln/detail/CVE-2026-77261)
- [https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460](https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460)
- [https://github.com/sooperset/mcp-atlassian/pull/1448](https://github.com/sooperset/mcp-atlassian/pull/1448)
- [https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0](https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0)
- [https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-6529-c226-h328](https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-6529-c226-h328)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

[Book a demo](https://panop.io/demo)