CVE-2026-81509
MediumCVSS 6.1Exploitation Probability (EPSS)
Low risk25th percentile - higher than 25% of all known CVEs
Summary
nforwardauth versions prior to 1.5.1 accept an unvalidated `r` query parameter on the `/login` endpoint and use it as the post-authentication redirect destination. An unauthenticated attacker can create a legitimate nforwardauth login URL that redirects a victim to an attacker-controlled website after successful authentication, facilitating phishing and other social-engineering attacks.
Risk Assessment
An attacker can abuse trust in the legitimate authentication domain to redirect users to malicious websites and harvest credentials.
Recommendation
Update nforwardauth to version 1.5.1 or later, which contains the patch.
Related vulnerabilities
- CVE-2026-114425Critical
SEPPmail Secure Email Gateway before 15.1.1 trusts a file path supplied in externally provided Large File Transfer attachment metadata. An unauthenticated remote sender can cause the mail-processing worker to disclose, move, or delete an accessible regular file when LFT is enabled and the message reaches an affected secure-mail processing path. The validated workers ran as root.
- CVE-2026-114424Critical
SEPPmail Secure Email Gateway before 15.1.1 can evaluate attacker-influenced replacement text as Perl code in sender or recipient replacement rules. An unauthenticated remote sender can execute operating-system commands in the mail-processing worker context when an active rule uses message-derived replacement data and its search condition matches. The validated worker context was root.
- CVE-2026-121802Critical
@better-auth/expo before 1.7.16 signs a caller-supplied state value without verifying that it was issued by the server. This allows account-takeover outcomes, such as unauthenticated changes of any account's email address.
- CVE-2026-121615Critical
Linksys E5600 1.1.0.26 contains an improper authentication vulnerability in /cgi-bin/mesh_login.cgi (Login Handler). The attack can be launched remotely and the exploit has been publicly disclosed. The vendor did not respond and the product is no longer supported.
- CVE-2026-121609Critical
A vulnerability was identified in the Qihoo 360 Whole Home Router M5 version 4.0.17.1566 within the boot script /etc/init.d/mpt (Home function). The issue involves hard-coded credentials. The exploit is publicly available and remote exploitation is possible.
- CVE-2026-121607Critical
A vulnerability was found in Qihoo 360 D603-2, D600-2, D606-6 and D706 up to version 6.4.9 in the testspeed_command function of /fs2/bin/iscm. Manipulating the host argument results in OS command injection. The attack can be initiated remotely and the exploit has been made public.
- CVE-2026-121606Critical
A vulnerability was found in Qihoo 360 devices (models D621-2, D603-2, D600-2, D619, D606-6 and D706 up to 6.4.9) in the verify_sign function of fs2/bin/iscm responsible for firmware signature verification. Manipulating the sign argument leads to improper verification of cryptographic signatures. The attack can be launched remotely and the exploit has been publicly disclosed.
- CVE-2026-121600Critical
A vulnerability was found in TOTOLINK A950RG version 4.1.2cu.5268_B20221104 in the setMacFilterRules function of /cgi-bin/cstecgi.cgi handling MAC filtering. Manipulating the addEffect argument causes a stack-based buffer overflow. The attack can be initiated remotely and the exploit is publicly available.
- CVE-2026-121599Critical
A vulnerability was detected in TOTOLINK A950RG version 4.1.2cu.5268_B20221104 in the setWiFiMultipleConfig/delWiFiMultipleConfig functions of /cgi-bin/cstecgi.cgi handling Multi-SSID configuration. Manipulating the wepkey2/wepkey3 arguments results in a stack-based buffer overflow. The attack can be launched remotely and the exploit is now public.
- CVE-2026-121598Critical
A security vulnerability was detected in TOTOLINK A950RG version 4.1.2cu.5268_B20221104 in the strcpy function of /cgi-bin/cstecgi.cgi handling basic wireless configuration. Manipulating the wepkey argument leads to a stack-based buffer overflow. The attack can be initiated remotely and the exploit has been publicly disclosed.
Original NVD description (English source)
nforwardauth is a forward auth service that allows the use of a single authentication middleware for multiple sites. Versions prior to 1.5.1 accept an unvalidated `r` query parameter on the `/login` endpoint and use them as the post-authentication redirect destination. An unauthenticated attacker can create a legitimate `nforwardauth` login URL that redirects a victim to an attacker-controlled website after the victim successfully authenticates. This issue may facilitate phishing and other social-engineering attacks by abusing the trust associated with the legitimate authentication domain. This vulnerability does not provide an unauthenticated ForwardAuth bypass. Version 1.5.1 contains a patch.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS