CVE-2026-31859

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Source
https://cve.org/CVERecord?id=CVE-2026-31859
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31859.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-31859
Aliases
Published
2026-03-11T17:37:19.065Z
Modified
2026-04-02T13:24:02.694083Z
Severity
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N CVSS Calculator
Summary
Craft has Reflective XSS via incomplete return URL sanitization
Details

Craft is a content management system (CMS). The fix for CVE-2025-35939 in craftcms/cms introduced a striptags() call in src/web/User.php to sanitize return URLs before they are stored in the session. However, striptags() only removes HTML tags (angle brackets) -- it does not inspect or filter URL schemes. Payloads like javascript:alert(document.cookie) contain no HTML tags and pass through strip_tags() completely unmodified, enabling reflected XSS when the return URL is rendered in an href attribute. This vulnerability is fixed in 5.9.7 and 4.17.3.

Database specific 
{
    "cwe_ids": [
        "CWE-116",
        "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31859.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/craftcms/cms

Affected ranges

Type
GIT
Repo
https://github.com/craftcms/cms
Events
Introduced
7ad3a61e84c0266d24e34d8ce3ebd13154d60b92
Fixed
17bf79c1dbc249b6c79d585eba1414838dc43521
Database specific 
{
    "versions": [
        {
            "introduced": "4.15.3"
        },
        {
            "fixed": "4.17.3"
        }
    ]
}
Type
GIT
Repo
https://github.com/craftcms/cms
Events
Introduced
679b82edce8c60ce1008dc70740bf2610adac57d
Fixed
9986382fbf26ed5cd46926ecd84084bf1b564680
Database specific 
{
    "versions": [
        {
            "introduced": "5.7.5"
        },
        {
            "fixed": "5.9.7"
        }
    ]
}

Affected versions

4.*
4.15.3
4.15.4
4.15.5
4.15.6
4.15.6.1
4.15.6.2
4.15.7
4.16.0
4.16.1
4.16.10
4.16.11
4.16.12
4.16.13
4.16.14
4.16.15
4.16.16
4.16.17
4.16.18
4.16.19
4.16.2
4.16.3
4.16.4
4.16.5
4.16.6
4.16.6.1
4.16.7
4.16.8
4.16.9
4.16.9.1
4.17.0
4.17.0-beta.1
4.17.0-beta.2
4.17.1
4.17.2
5.*
5.7.10
5.7.11
5.7.5
5.7.6
5.7.7
5.7.8
5.7.8.1
5.7.8.2
5.7.9
5.8.0
5.8.1
5.8.10
5.8.11
5.8.12
5.8.13
5.8.13.1
5.8.13.2
5.8.14
5.8.15
5.8.16
5.8.17
5.8.18
5.8.19
5.8.2
5.8.20
5.8.21
5.8.22
5.8.23
5.8.3
5.8.4
5.8.5
5.8.6
5.8.7
5.8.8
5.8.9
5.9.0
5.9.0-beta.1
5.9.0-beta.2
5.9.1
5.9.2
5.9.3
5.9.4
5.9.5
5.9.6

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31859.json"