Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to canonicalize IPv4-mapped IPv6 addresses before reserved IP validation which allows an attacker to perform SSRF attacks against internal services via IPv4-mapped IPv6 literals (e.g., [::ffff:127.0.0.1]).. Mattermost Advisory ID: MMSA-2026-00585
Metrics
Affected Vendors & Products
References
| Link | Providers |
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| https://mattermost.com/security-updates |
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History
Wed, 18 Mar 2026 14:00:00 +0000
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| CPEs | cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | |
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Mattermost mattermost Server
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Tue, 17 Mar 2026 10:00:00 +0000
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Mattermost
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Mon, 16 Mar 2026 19:15:00 +0000
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ssvc
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Mon, 16 Mar 2026 15:15:00 +0000
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| Description | Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to canonicalize IPv4-mapped IPv6 addresses before reserved IP validation which allows an attacker to perform SSRF attacks against internal services via IPv4-mapped IPv6 literals (e.g., [::ffff:127.0.0.1]).. Mattermost Advisory ID: MMSA-2026-00585 | |
| Title | SSRF bypass via IPv4-mapped IPv6 literals | |
| Weaknesses | CWE-918 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: Mattermost
Published: 2026-03-16T14:53:31.280Z
Updated: 2026-03-16T18:38:07.619Z
Reserved: 2026-02-13T10:45:36.473Z
Link: CVE-2026-2455
Updated: 2026-03-16T18:38:00.408Z
Status : Analyzed
Published: 2026-03-16T15:16:22.277
Modified: 2026-03-18T13:55:00.147
Link: CVE-2026-2455
No data.