ash-project ash_authentication_oauth2_server up to 0.3.0 CIMD AshAuthentication.Oauth2Server.CIMD.ReqFetcher server-side request forgery

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k1.49+

Summaryinfo

A vulnerability classified as critical has been found in ash-project ash_authentication_oauth2_server up to 0.3.0. Affected by this vulnerability is the function AshAuthentication.Oauth2Server.CIMD.ReqFetcher of the component CIMD. This manipulation causes server-side request forgery. This vulnerability is registered as CVE-2026-82757. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability has been found in ash-project ash_authentication_oauth2_server up to 0.3.0 and classified as critical. Affected by this vulnerability is the function AshAuthentication.Oauth2Server.CIMD.ReqFetcher of the component CIMD. The manipulation with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Server-Side Request Forgery (SSRF) vulnerability in ash-project ash_authentication_oauth2_server allows an attacker who controls a client metadata URL and its DNS to make the server connect to internal or loopback addresses. public_ip?/1 in AshAuthentication.Oauth2Server.CIMD.ReqFetcher enforces the outbound policy for CIMD metadata fetches. It classified several address forms as publicly routable that are not: IPv4-compatible ::/96 (for example ::127.0.0.1), SIIT IPv4-translated ::ffff:0:0:0/96, and deprecated site-local fec0::/10. A returned AAAA record in one of these ranges passed the policy, so a fetch pinned to that address reached space the policy was meant to block. This issue affects ash_authentication_oauth2_server: from 0.3.0 before 0.3.1.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-82757 since 08/31/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available.

Upgrading to version 0.3.1 eliminates this vulnerability.

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Productinfo

Type

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

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: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: ash_authentication_oauth2_server 0.3.1

Timelineinfo

08/31/2026 CVE reserved
09/07/2026 +7 days VulDB entry created
09/08/2026 +0 days Advisory disclosed
09/08/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-82757 (🔒)
GCVE (CVE): GCVE-0-2026-82757
GCVE (VulDB): GCVE-100-399685

Entryinfo

Created: 09/08/2026 00:59
Changes: 09/08/2026 00:59 (69)
Complete: 🔍
Cache ID: 216::103

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