CVE-2025-35939
5.3, medium Known exploitedCraft CMS External Control of Assumed-Immutable Web Parameter Vulnerability
- CVSS
- 5.3, medium medium CVSS v3.1
- EPSS, next 30 days
- 1% higher than 71% of scored CVEs
- Exploitation
- Confirmed in the wild
- Published
- 7 May 2025a year ago
Known exploited
CISA added this to the Known Exploited Vulnerabilities Catalog on 2 Jun 2025. US federal agencies had to remediate by 23 Jun 2025, a deadline that has passed.
Required action. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Description
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.
Details
- Vendor
- Craft CMS
- Product
- CMS
- Weakness
- CWE-472 (opens in a new tab)
- Status
- Analyzed
- Updated
- 17 Jun 2026
- Assigner
- 9119a7d8-5eab-497f-8521-727c672e3725
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
References 6
Patches and fixes 1
Advisories 1
Other references 4
The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.
Other Craft CMS CVEs
Every Craft CMS CVE we holdSame vendor in what we hold, not a known link between the flaws.
- CVE-2025-32432 Craft CMS Code Injection Vulnerability KEV EPSS 100% 10, critical
- CVE-2025-23209 Craft CMS Code Injection Vulnerability KEV EPSS 22% 8.1, high
- CVE-2024-56145 Craft CMS Code Injection Vulnerability KEV EPSS 97% 9.8, critical
Beyond this page
Is CVE-2025-35939 in your network?
This page tells you how dangerous CVE-2025-35939 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.
CVE-2025-35939 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.
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EXYS7600 OCELOT
Find it before attackers do
Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2025-35939 comes with the devices to patch.
Learn more about EXYS7600 OCELOT -
EXYS7950 KONDRA
Detect it if it's exploited
Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.
Learn more about EXYS7950 KONDRA
Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.