FlareSolverr up to 3.4.6 API server-side request forgery

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.0$0-$5k2.25-

Summaryinfo

A vulnerability was found in FlareSolverr up to 3.4.6 and classified as critical. This vulnerability affects unknown code of the component API. The manipulation results in server-side request forgery. This vulnerability is known as CVE-2026-51031. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability classified as critical has been found in FlareSolverr up to 3.4.6. Affected is an unknown code of the component API. The manipulation with an unknown input leads to a server-side request forgery vulnerability. CWE is classifying the issue as CWE-918. 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. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

FlareSolverr before version 3.4.7 contains a server-side request forgery (SSRF) vulnerability in the /v1 API endpoint. This allows a remote attacker to obtain sensitive information

The advisory is available at xinyi234.github.io. This vulnerability is traded as CVE-2026-51031 since 06/07/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The technical details are unknown and an exploit is not available.

Upgrading to version 3.4.7 eliminates this vulnerability.

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Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Server-side request forgery
CWE: CWE-918
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Upgrade: FlareSolverr 3.4.7

Timelineinfo

06/07/2026 CVE reserved
07/20/2026 +43 days VulDB entry created
07/21/2026 +0 days Advisory disclosed
07/21/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: xinyi234.github.io
Status: Confirmed

CVE: CVE-2026-51031 (🔒)
GCVE (CVE): GCVE-0-2026-51031
GCVE (VulDB): GCVE-100-380790

Entryinfo

Created: 07/21/2026 00:10
Changes: 07/21/2026 00:10 (52)
Complete: 🔍
Cache ID: 216::103

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