CVE-2026-26207

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Source
https://cve.org/CVERecord?id=CVE-2026-26207
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26207.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-26207
Aliases
Published
2026-02-26T15:04:14.557Z
Modified
2026-03-03T14:26:18.490471Z
Severity
  • 5.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N CVSS Calculator
Summary
DIscourse's discourse-policy plugin lacks post access check
Details

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, discourse-policy plugin allows any authenticated user to interact with policies on posts they do not have permission to view. The PolicyController loads posts by ID without verifying the current user's access, enabling policy group members to accept/unaccept policies on posts in private categories or PMs they cannot see and any authenticated user to enumerate which post IDs have policies attached via differentiated error responses (information disclosure). The issue is patched in versions 2025.12.2, 2026.1.1, and 2026.2.0 by adding a guardian.can_see?(@post) check in the set_post before_action, ensuring post visibility is verified before any policy action is processed. As a workaround, disabling the discourse-policy plugin (policy_enabled = false) eliminates the vulnerability. There is no other workaround without upgrading.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26207.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-862"
    ]
}
References

Affected packages

Git / github.com/discourse/discourse

Affected ranges

Type
GIT
Repo
https://github.com/discourse/discourse
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
9c924c6f4f3885ab616e21bec2447af7056b4322
Database specific 
{
    "versions": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2025.12.2"
        }
    ]
}
Type
GIT
Repo
https://github.com/discourse/discourse
Events
Introduced
322d3c0ac6a8f133b3f82875e9dbbe310f638c1b
Fixed
8a2a8b7d3a494435949a12ad078b22509f54bd58
Database specific 
{
    "versions": [
        {
            "introduced": "2026.1.0-latest"
        },
        {
            "fixed": "2026.1.1"
        }
    ]
}
Type
GIT
Repo
https://github.com/discourse/discourse
Events
Introduced
f7cec86997edc21d6074ceb7666f7e2e6e1b1fdf
Fixed
f7cec86997edc21d6074ceb7666f7e2e6e1b1fdf
Database specific 
{
    "versions": [
        {
            "introduced": "2026.2.0-latest"
        },
        {
            "fixed": "2026.2.0"
        }
    ]
}

Affected versions

Other
beta
esr
latest-release
release
stable
v0.*
v0.8.0
v0.8.1
v0.8.2
v0.8.3
v0.8.4
v0.8.5
v0.8.6
v0.8.7
v0.8.8
v0.8.9
v0.9.0
v0.9.1
v0.9.2
v0.9.2.5
v0.9.2.6
v0.9.3
v0.9.3.5
v0.9.4
v0.9.5
v0.9.5.1
v0.9.5.2
v0.9.6
v0.9.6.1
v0.9.6.2
v0.9.6.3
v0.9.6.4
v0.9.7
v0.9.7.1
v0.9.7.2
v0.9.7.3
v0.9.7.4
v0.9.7.5
v0.9.7.6
v0.9.7.7
v0.9.7.8
v0.9.7.9
v0.9.8
v0.9.8.1
v0.9.8.10
v0.9.8.11
v0.9.8.2
v0.9.8.3
v0.9.8.4
v0.9.8.5
v0.9.8.6
v0.9.8.7
v0.9.8.8
v0.9.8.9
v0.9.9.1
v0.9.9.10
v0.9.9.11
v0.9.9.12
v0.9.9.13
v0.9.9.14
v0.9.9.15
v0.9.9.16
v0.9.9.17
v0.9.9.18
v0.9.9.2
v0.9.9.3
v0.9.9.4
v0.9.9.5
v0.9.9.6
v0.9.9.7
v0.9.9.8
v0.9.9.9
v1.*
v1.0.0
v1.1.0.beta2
v1.1.0.beta3
v1.1.0.beta4
v1.1.0.beta5
v1.1.0.beta6
v1.1.0.beta6b
v1.1.0.beta7
v1.1.0.beta8
v1.2.0.beta1
v1.2.0.beta2
v1.2.0.beta3
v1.2.0.beta4
v1.2.0.beta5
v1.2.0.beta6
v1.2.0.beta7
v1.2.0.beta8
v1.2.0.beta9
v1.3.0.beta1
v1.3.0.beta10
v1.3.0.beta11
v1.3.0.beta2
v1.3.0.beta3
v1.3.0.beta4
v1.3.0.beta5
v1.3.0.beta6
v1.3.0.beta7
v1.3.0.beta9
v1.4.0.beta1
v1.4.0.beta10
v1.4.0.beta11
v1.4.0.beta12
v1.4.0.beta2
v1.4.0.beta3
v1.4.0.beta4
v1.4.0.beta5
v1.4.0.beta6
v1.4.0.beta7
v1.4.0.beta8
v1.4.0.beta9
v1.5.0.beta1
v1.5.0.beta10
v1.5.0.beta11
v1.5.0.beta12
v1.5.0.beta13
v1.5.0.beta13b
v1.5.0.beta14
v1.5.0.beta2
v1.5.0.beta3
v1.5.0.beta4
v1.5.0.beta5
v1.5.0.beta6
v1.5.0.beta7
v1.5.0.beta8
v1.5.0.beta9
v1.6.0.beta1
v1.6.0.beta10
v1.6.0.beta11
v1.6.0.beta12
v1.6.0.beta2
v1.6.0.beta3
v1.6.0.beta4
v1.6.0.beta5
v1.6.0.beta6
v1.6.0.beta7
v1.6.0.beta8
v1.6.0.beta9
v1.7.0.beta1
v1.7.0.beta10
v1.7.0.beta11
v1.7.0.beta2
v1.7.0.beta3
v1.7.0.beta4
v1.7.0.beta5
v1.7.0.beta6
v1.7.0.beta7
v1.7.0.beta8
v1.7.0.beta9
v1.8.0.beta1
v1.8.0.beta10
v1.8.0.beta11
v1.8.0.beta12
v1.8.0.beta13
v1.8.0.beta2
v1.8.0.beta3
v1.8.0.beta4
v1.8.0.beta5
v1.8.0.beta6
v1.8.0.beta7
v1.8.0.beta8
v1.8.0.beta9
v1.9.0.beta1
v1.9.0.beta10
v1.9.0.beta11
v1.9.0.beta12
v1.9.0.beta13
v1.9.0.beta14
v1.9.0.beta15
v1.9.0.beta16
v1.9.0.beta17
v1.9.0.beta2
v1.9.0.beta3
v1.9.0.beta4
v1.9.0.beta5
v1.9.0.beta6
v1.9.0.beta7
v1.9.0.beta8
v1.9.0.beta9
v2.*
v2.0.0.beta1
v2.0.0.beta10
v2.0.0.beta2
v2.0.0.beta3
v2.0.0.beta4
v2.0.0.beta5
v2.0.0.beta6
v2.0.0.beta7
v2.0.0.beta8
v2.0.0.beta9
v2.1.0.beta1
v2.1.0.beta2
v2.1.0.beta3
v2.1.0.beta4
v2.1.0.beta5
v2.1.0.beta6
v2.2.0.beta1
v2.2.0.beta10
v2.2.0.beta2
v2.2.0.beta3
v2.2.0.beta4
v2.2.0.beta5
v2.2.0.beta6
v2.2.0.beta7
v2.2.0.beta8
v2.2.0.beta9
v2.3.0.beta1
v2.3.0.beta10
v2.3.0.beta11
v2.3.0.beta2
v2.3.0.beta3
v2.3.0.beta4
v2.3.0.beta5
v2.3.0.beta6
v2.3.0.beta7
v2.3.0.beta8
v2.3.0.beta9
v2.4.0.beta1
v2.4.0.beta10
v2.4.0.beta11
v2.4.0.beta2
v2.4.0.beta3
v2.4.0.beta4
v2.4.0.beta5
v2.4.0.beta6
v2.4.0.beta7
v2.4.0.beta8
v2.4.0.beta9
v2.5.0.beta1
v2.5.0.beta2
v2.5.0.beta3
v2.5.0.beta4
v2.5.0.beta5
v2.5.0.beta6
v2.5.0.beta7
v2.6.0.beta1
v2.6.0.beta2
v2.6.0.beta3
v2.6.0.beta4
v2.6.0.beta5
v2.6.0.beta6
v2.7.0.beta1
v2.7.0.beta2
v2.7.0.beta3
v2.7.0.beta4
v2.7.0.beta5
v2.7.0.beta6
v2.7.0.beta7
v2.7.0.beta8
v2.7.0.beta9
v2.8.0.beta1
v2.8.0.beta10
v2.8.0.beta11
v2.8.0.beta2
v2.8.0.beta3
v2.8.0.beta4
v2.8.0.beta5
v2.8.0.beta6
v2.8.0.beta7
v2.8.0.beta8
v2.8.0.beta9
v2.9.0.beta1
v2.9.0.beta10
v2.9.0.beta11
v2.9.0.beta12
v2.9.0.beta13
v2.9.0.beta14
v2.9.0.beta2
v2.9.0.beta3
v2.9.0.beta4
v2.9.0.beta5
v2.9.0.beta6
v2.9.0.beta7
v2.9.0.beta8
v2.9.0.beta9
v2025.*
v2025.12.0
v2025.12.0-latest
v2025.12.1
v2026.*
v2026.1.0
v2026.1.0-latest
v2026.2.0-latest
v3.*
v3.0.0.beta15
v3.0.0.beta16
v3.1.0.beta1
v3.1.0.beta2
v3.1.0.beta3
v3.1.0.beta4
v3.1.0.beta5
v3.1.0.beta6
v3.1.0.beta7
v3.1.0.beta8
v3.2.0.beta1
v3.2.0.beta2
v3.2.0.beta3
v3.2.0.beta4
v3.2.0.beta5
v3.3.0.beta1
v3.3.0.beta2
v3.3.0.beta3
v3.3.0.beta4
v3.3.0.beta5
v3.3.0.beta6
v3.4.0.beta1
v3.4.0.beta2
v3.4.0.beta3
v3.4.0.beta4
v3.5.0.beta1
v3.5.0.beta2
v3.5.0.beta3
v3.5.0.beta4
v3.5.0.beta5
v3.5.0.beta6
v3.5.0.beta7
v3.5.0.beta8
v3.5.0.beta9
v3.6.0.beta1
v3.6.0.beta2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26207.json"