GHSA-89vf-4333-qx8v

Suggest an improvement
Source
https://github.com/advisories/GHSA-89vf-4333-qx8v
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-89vf-4333-qx8v/GHSA-89vf-4333-qx8v.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-89vf-4333-qx8v
Aliases
Downstream
Published
2026-03-23T20:53:28Z
Modified
2026-09-10T03:50:38Z
Severity
  • 5.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
Rails Active Support has a possible XSS vulnerability in SafeBuffer#%
Details

Impact

SafeBuffer#% does not propagate the @html_unsafe flag to the newly created buffer. If a SafeBuffer is mutated in place (e.g. via gsub!) and then formatted with % using untrusted arguments, the result incorrectly reports html_safe? == true, bypassing ERB auto-escaping and possibly leading to XSS.

Releases

The fixed releases are available at the normal locations.

Credit

This issue was responsibly reported by @ch4n3-yoon

Database specific 
{
    "cwe_ids": [
        "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-23T20:53:28Z",
    "nvd_published_at": "2026-03-24T00:16:28Z",
    "severity": "MODERATE"
}
References

Affected packages

RubyGems / activesupport

Package

Name
activesupport
Purl
pkg:gem/activesupport

Affected ranges

Type
ECOSYSTEM
Events
Introduced
8.1.0.beta1
Fixed
8.1.2.1

Affected versions

8.*
8.1.0.beta1
8.1.0.rc1
8.1.0
8.1.1
8.1.2

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-89vf-4333-qx8v/GHSA-89vf-4333-qx8v.json"

RubyGems / activesupport

Package

Name
activesupport
Purl
pkg:gem/activesupport

Affected ranges

Type
ECOSYSTEM
Events
Introduced
8.0.0.beta1
Fixed
8.0.4.1

Affected versions

8.*
8.0.0.beta1
8.0.0.rc1
8.0.0.rc2
8.0.0
8.0.0.1
8.0.1
8.0.2
8.0.2.1
8.0.3
8.0.4

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-89vf-4333-qx8v/GHSA-89vf-4333-qx8v.json"

RubyGems / activesupport

Package

Name
activesupport
Purl
pkg:gem/activesupport

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
7.2.3.1

Affected versions

1.*
1.0.0
1.0.1
1.0.2
1.0.3
1.0.4
1.1.0
1.1.1
1.2.1
1.2.2
1.2.3
1.2.4
1.2.5
1.3.0
1.3.1
1.4.0
1.4.1
1.4.2
1.4.3
1.4.4
2.*
2.0.0
2.0.1
2.0.2
2.0.4
2.0.5
2.1.0
2.1.1
2.1.2
2.2.2
2.2.3
2.3.2
2.3.3
2.3.4
2.3.5
2.3.6.pre
2.3.6
2.3.7
2.3.8.pre1
2.3.8
2.3.9.pre
2.3.9
2.3.10
2.3.11
2.3.12
2.3.14
2.3.15
2.3.16
2.3.17
2.3.18
3.*
3.0.0.beta
3.0.0.beta2
3.0.0.beta3
3.0.0.beta4
3.0.pre
3.0.0.rc
3.0.0.rc2
3.0.0
3.0.1
3.0.2
3.0.3
3.0.4.rc1
3.0.4
3.0.5.rc1
3.0.5
3.0.6.rc1
3.0.6.rc2
3.0.6
3.0.7.rc1
3.0.7.rc2
3.0.7
3.0.8.rc1
3.0.8.rc2
3.0.8.rc4
3.0.8
3.0.9.rc1
3.0.9.rc3
3.0.9.rc4
3.0.9.rc5
3.0.9
3.0.10.rc1
3.0.10
3.0.11
3.0.12.rc1
3.0.12
3.0.13.rc1
3.0.13
3.0.14
3.0.15
3.0.16
3.0.17
3.0.18
3.0.19
3.0.20
3.1.0.beta1
3.1.0.rc1
3.1.0.rc2
3.1.0.rc3
3.1.0.rc4
3.1.0.rc5
3.1.0.rc6
3.1.0.rc8
3.1.0
3.1.1.rc1
3.1.1.rc2
3.1.1.rc3
3.1.1
3.1.2.rc1
3.1.2.rc2
3.1.2
3.1.3
3.1.4.rc1
3.1.4
3.1.5.rc1
3.1.5
3.1.6
3.1.7
3.1.8
3.1.9
3.1.10
3.1.11
3.1.12
3.2.0.rc1
3.2.0.rc2
3.2.0
3.2.1
3.2.2.rc1
3.2.2
3.2.3.rc1
3.2.3.rc2
3.2.3
3.2.4.rc1
3.2.4
3.2.5
3.2.6
3.2.7.rc1
3.2.7
3.2.8.rc1
3.2.8.rc2
3.2.8
3.2.9.rc1
3.2.9.rc2
3.2.9.rc3
3.2.9
3.2.10
3.2.11
3.2.12
3.2.13.rc1
3.2.13.rc2
3.2.13
3.2.14.rc1
3.2.14.rc2
3.2.14
3.2.15.rc1
3.2.15.rc2
3.2.15.rc3
3.2.15
3.2.16
3.2.17
3.2.18
3.2.19
3.2.20
3.2.21
3.2.22
3.2.22.1
3.2.22.2
3.2.22.3
3.2.22.4
3.2.22.5
4.*
4.0.0.beta1
4.0.0.rc1
4.0.0.rc2
4.0.0
4.0.1.rc1
4.0.1.rc2
4.0.1.rc3
4.0.1.rc4
4.0.1
4.0.2
4.0.3
4.0.4.rc1
4.0.4
4.0.5
4.0.6.rc1
4.0.6.rc2
4.0.6.rc3
4.0.6
4.0.7
4.0.8
4.0.9
4.0.10.rc1
4.0.10.rc2
4.0.10
4.0.11
4.0.11.1
4.0.12
4.0.13.rc1
4.0.13
4.1.0.beta1
4.1.0.beta2
4.1.0.rc1
4.1.0.rc2
4.1.0
4.1.1
4.1.2.rc1
4.1.2.rc2
4.1.2.rc3
4.1.2
4.1.3
4.1.4
4.1.5
4.1.6.rc1
4.1.6.rc2
4.1.6
4.1.7
4.1.7.1
4.1.8
4.1.9.rc1
4.1.9
4.1.10.rc1
4.1.10.rc2
4.1.10.rc3
4.1.10.rc4
4.1.10
4.1.11
4.1.12.rc1
4.1.12
4.1.13.rc1
4.1.13
4.1.14.rc1
4.1.14.rc2
4.1.14
4.1.14.1
4.1.14.2
4.1.15.rc1
4.1.15
4.1.16.rc1
4.1.16
4.2.0.beta1
4.2.0.beta2
4.2.0.beta3
4.2.0.beta4
4.2.0.rc1
4.2.0.rc2
4.2.0.rc3
4.2.0
4.2.1.rc1
4.2.1.rc2
4.2.1.rc3
4.2.1.rc4
4.2.1
4.2.2
4.2.3.rc1
4.2.3
4.2.4.rc1
4.2.4
4.2.5.rc1
4.2.5.rc2
4.2.5
4.2.5.1
4.2.5.2
4.2.6.rc1
4.2.6
4.2.7.rc1
4.2.7
4.2.7.1
4.2.8.rc1
4.2.8
4.2.9.rc1
4.2.9.rc2
4.2.9
4.2.10.rc1
4.2.10
4.2.11
4.2.11.1
4.2.11.2
4.2.11.3
5.*
5.0.0.beta1
5.0.0.beta1.1
5.0.0.beta2
5.0.0.beta3
5.0.0.beta4
5.0.0.racecar1
5.0.0.rc1
5.0.0.rc2
5.0.0
5.0.0.1
5.0.1.rc1
5.0.1.rc2
5.0.1
5.0.2.rc1
5.0.2
5.0.3
5.0.4.rc1
5.0.4
5.0.5.rc1
5.0.5.rc2
5.0.5
5.0.6.rc1
5.0.6
5.0.7
5.0.7.1
5.0.7.2
5.1.0.beta1
5.1.0.rc1
5.1.0.rc2
5.1.0
5.1.1
5.1.2.rc1
5.1.2
5.1.3.rc1
5.1.3.rc2
5.1.3.rc3
5.1.3
5.1.4.rc1
5.1.4
5.1.5.rc1
5.1.5
5.1.6
5.1.6.1
5.1.6.2
5.1.7.rc1
5.1.7
5.2.0.beta1
5.2.0.beta2
5.2.0.rc1
5.2.0.rc2
5.2.0
5.2.1.rc1
5.2.1
5.2.1.1
5.2.2.rc1
5.2.2
5.2.2.1
5.2.3.rc1
5.2.3
5.2.4.rc1
5.2.4
5.2.4.1
5.2.4.2
5.2.4.3
5.2.4.4
5.2.4.5
5.2.4.6
5.2.5
5.2.6
5.2.6.1
5.2.6.2
5.2.6.3
5.2.7
5.2.7.1
5.2.8
5.2.8.1
6.*
6.0.0.beta1
6.0.0.beta2
6.0.0.beta3
6.0.0.rc1
6.0.0.rc2
6.0.0
6.0.1.rc1
6.0.1
6.0.2.rc1
6.0.2.rc2
6.0.2
6.0.2.1
6.0.2.2
6.0.3.rc1
6.0.3
6.0.3.1
6.0.3.2
6.0.3.3
6.0.3.4
6.0.3.5
6.0.3.6
6.0.3.7
6.0.4
6.0.4.1
6.0.4.2
6.0.4.3
6.0.4.4
6.0.4.5
6.0.4.6
6.0.4.7
6.0.4.8
6.0.5
6.0.5.1
6.0.6
6.0.6.1
6.1.0.rc1
6.1.0.rc2
6.1.0
6.1.1
6.1.2
6.1.2.1
6.1.3
6.1.3.1
6.1.3.2
6.1.4
6.1.4.1
6.1.4.2
6.1.4.3
6.1.4.4
6.1.4.5
6.1.4.6
6.1.4.7
6.1.5
6.1.5.1
6.1.6
6.1.6.1
6.1.7
6.1.7.1
6.1.7.2
6.1.7.3
6.1.7.4
6.1.7.5
6.1.7.6
6.1.7.7
6.1.7.8
6.1.7.9
6.1.7.10
7.*
7.0.0.alpha1
7.0.0.alpha2
7.0.0.rc1
7.0.0.rc2
7.0.0.rc3
7.0.0
7.0.1
7.0.2
7.0.2.1
7.0.2.2
7.0.2.3
7.0.2.4
7.0.3
7.0.3.1
7.0.4
7.0.4.1
7.0.4.2
7.0.4.3
7.0.5
7.0.5.1
7.0.6
7.0.7
7.0.7.1
7.0.7.2
7.0.8
7.0.8.1
7.0.8.2
7.0.8.3
7.0.8.4
7.0.8.5
7.0.8.6
7.0.8.7
7.0.9
7.0.10
7.1.0.beta1
7.1.0.rc1
7.1.0.rc2
7.1.0
7.1.1
7.1.2
7.1.3
7.1.3.1
7.1.3.2
7.1.3.3
7.1.3.4
7.1.4
7.1.4.1
7.1.4.2
7.1.5
7.1.5.1
7.1.5.2
7.1.6
7.2.0.beta1
7.2.0.beta2
7.2.0.beta3
7.2.0.rc1
7.2.0
7.2.1
7.2.1.1
7.2.1.2
7.2.2
7.2.2.1
7.2.2.2
7.2.3

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-89vf-4333-qx8v/GHSA-89vf-4333-qx8v.json"