CVE-2025-35939
Confirmed PUBLISHEDCraft CMS stores user-provided content in session files
1 day faster than CISA KEV
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
Craft CMS stores arbitrary content provided by unauthenticated users in session files. This content could be accessed and executed, possibly using an independent vulnerability. Craft CMS redirects requests that require authentication to the login page and generates a session file on the server at '/var/lib/php/sessions'. Such session files are named 'sess_[session_value]', where '[session_value]' is provided to the client in a 'Set-Cookie' response header. Craft CMS stores the return URL requested by the client without sanitizing parameters. Consequently, an unauthenticated client can introduce arbitrary values, such as PHP code, to a known local file location on the server. Craft CMS versions 5.7.5 and 4.15.3 have been released to address this issue.
- CVE Published
- May 07, 2025
- Exploitation Reported
- Jun 01, 2026
- CVSS
- 6.9 Medium
- EPSS
- 1.1%
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| Craft |
CMS
|
0 to < 5.7.5 |
Affected |
| Craft |
CMS
|
5.7.5 |
Unaffected |
| Craft |
CMS
|
0 to < 4.15.3 |
Affected |
| Craft |
CMS
|
4.15.3 |
Unaffected |
CVE References
- url github.com · CVE Record https://github.com/craftcms/cms/pull/17220
- url github.com · CVE Record https://github.com/craftcms/cms/releases/tag/4.15.3
- url github.com · CVE Record https://github.com/craftcms/cms/releases/tag/5.7.5
- url cve.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2025-35939
- url raw.githubusercontent.com · CVE Record https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/...
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CVE First | 2026-06-01 10:31 UTC |
| CISA | 2026-06-02 14:07 UTC |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Exploitation Status
Exploited in the wild
Recorded 2026-06-01 10:31:13 UTC · CVE
Weaknesses (CWE)
-
External Control of Assumed-Immutable Web Parameter
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
14:07 UTC about 2 months ago14:07 UTC · about 2 months ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
10:31 UTC about 2 months ago10:31 UTC · about 2 months ago
Added to KEVIntel KEV Feed
High-confidence, third-party attested exploitation
-
22:41 UTC about 1 year ago22:41 UTC · about 1 year ago
CVE published
Vulnerability disclosed publicly
-
20:57 UTC over 1 year ago20:57 UTC · over 1 year ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2025-35939
{
"cve_id": "CVE-2025-35939",
"title": "Craft CMS stores user-provided content in session files",
"affected_vendor": "Craft",
"affected_product": "CMS",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 6.9,
"epss_score": 0.01119,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}