VulnerabilityPublished 15 Dec 2025Updated 16 Dec 2025

CVE-2025-66844: grav · Server-Side Request Forgery (SSRF)

Affects gravSource CVE Database V5

Not known to be exploited · CVSS 9.1 Critical : upgrade to 1.7.49.5 as a priority.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score

9.1Critical

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.2% chance of exploitation in 30 days – higher than 21% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 1.7.49.5

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 15 Dec 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade yohane-mashiro/grav to 1.7.49.5.

Affected software

Product	Affected	Fixed in
GitHubyohane-mashiro/grav`pkg:github/yohane-mashiro/grav`Other threats	Affected <1.7.49.5	Fixed in 1.7.49.5

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Immediately upgrade Grav CMS installations to version 1.7.49.5 or later where the vulnerability is patched.
Audit and harden Twig template configurations to disallow registration or invocation of undefined PHP functions, preventing SSRF vectors.
Implement strict input validation and sanitization on any user-controllable content processed by Twig templates.
Employ network segmentation and firewall rules to restrict outbound HTTP requests from web servers to only necessary destinations, limiting SSRF impact.
Monitor web server logs and network traffic for unusual outbound requests indicative of SSRF exploitation attempts.
Use Web Application Firewalls (WAFs) with rules designed to detect and block SSRF attack patterns targeting Grav CMS.
Conduct regular security assessments and code reviews focusing on template processing and server-side request handling.
Educate development and operations teams about secure template usage and configuration best practices to prevent similar vulnerabilities.

Description

In grav <1.7.49.5, a SSRF (Server-Side Request Forgery) vector may be triggered via Twig templates when page content is processed by Twig and the configuration allows undefined PHP functions to be registered

Impact

For European organizations, the impact of CVE-2025-66844 can be severe. Exploitation can lead to unauthorized internal network access, data exfiltration, and potential lateral movement within corporate networks. Confidentiality is highly impacted as attackers may access sensitive internal services or data repositories. Integrity is also at risk if attackers manipulate server-side requests to alter data or configurations indirectly. Availability impact is low, but the breach of confidentiality and integrity can cause significant operational and reputational damage. Organizations relying on Grav CMS for public websites, intranet portals, or customer-facing applications are particularly vulnerable. Given the critical CVSS score and the lack of required authentication, attackers can exploit this vulnerability remotely and without user interaction, increasing the risk of automated mass scanning and exploitation attempts. European sectors such as finance, healthcare, government, and critical infrastructure that use Grav CMS or similar templating configurations face heightened risk. The vulnerability could also be leveraged in multi-stage attacks targeting internal network resources behind firewalls, which are otherwise protected from direct external access.

CWE-918Server-Side Request Forgery (SSRF) (opens in a new tab)
Base weaknessCWE Top 25 (2025): #22OWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.
OWASP Cheat Sheets
Server Side Request Forgery Prevention (opens in a new tab)
Unvalidated Redirects and Forwards (opens in a new tab)
Cross Site Scripting Prevention (opens in a new tab)
DOM based XSS Prevention (opens in a new tab)
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V12.6.1 (opens in a new tab)
V5.2.6 (opens in a new tab)
Attack patterns
Server Side Request Forgery (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

github.com/Yohane-Mashiro/grav_cve/issues/2 (opens in a new tab)

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 22 Dec 2025, 17:00 UTC

WeaknessesCWE-918

Technical details

References

Community reviews

Related threats