#auth

A deserialization vulnerability exists in h2oai/h2o-3 versions <= 3.46.0.7, allowing attackers to read arbitrary system files and execute arbitrary code. The vulnerability arises from improper handling of JDBC connection parameters, which can be exploited by bypassing regular expression checks and using double URL encoding. This issue impacts all users of the affected versions.

### Impact An HTML injection vulnerability in plaintext e-mails generated by Mailgen has been discovered. Your project is affected if you make use of the `Mailgen.generatePlaintext(email);` method and pass in user-generated content. The issue has been discovered and reported by Edoardo Ottavianelli (@edoardottt). ### Patches The vulnerability has been patched in commit https://github.com/eladnava/mailgen/commit/741a0190ddae0f408b22ae3b5f0f4c3f5cf4f11d and released to `npm` in version `2.0.30`. ### Workarounds Strip all HTML tags yourself before passing any content into `Mailgen.generatePlaintext(email);`. Thanks to Edoardo Ottavianelli (@edoardottt) for discovering and reporting this vulnerability.

## Background on exploitation This vulnerability manifests with the library's `getTags()` API, which allows specifying extra parameters passed to the `git log` command. In another API by this library - `getRawCommits()` there are secure practices taken to ensure that the extra parameter `path` is unable to inject an argument by ending the `git log` command with the special shell syntax `--`. However, the library does not follow the same practice for `getTags()` not attempts to sanitize for user input, validate the given params, or restrcit them to an allow list. Nor does it properly pass command-line flags to the `git` binary using the double-dash POSIX characters (`--`) to communicate the end of options. Thus, allowing users to exploit an argument injection vulnerability in Git due to the `--output=` command-line option that results with overwriting arbitrary files. ## Exploit 1. Install `@conventional-changelog/git-client@1.0.1` or earlier 2. Prepare a Git directory to be used as...

## Summary Authlib’s JWS verification accepts tokens that declare unknown critical header parameters (`crit`), violating RFC 7515 “must‑understand” semantics. An attacker can craft a signed token with a critical header (for example, `bork` or `cnf`) that strict verifiers reject but Authlib accepts. In mixed‑language fleets, this enables split‑brain verification and can lead to policy bypass, replay, or privilege escalation. ## Affected Component and Versions - Library: Authlib (JWS verification) - API: `authlib.jose.JsonWebSignature.deserialize_compact(...)` - Version tested: 1.6.3 - Configuration: Default; no allowlist or special handling for `crit` ## Details RFC 7515 (JWS) §4.1.11 defines `crit` as a “must‑understand” list: recipients MUST understand and enforce every header parameter listed in `crit`, otherwise they MUST reject the token. Security‑sensitive semantics such as token binding (e.g., `cnf` from RFC 7800) are often conveyed via `crit`. Observed behavior with Authlib 1...

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A critical token validation failure in Microsoft Entra ID (previously Azure Active Directory) could have allowed attackers to impersonate any user, including Global Administrators, across any tenant. The vulnerability, tracked as CVE-2025-55241, has been assigned the maximum CVSS score of 10.0. It has been described by Microsoft as a privilege escalation flaw in Azure Entra. There is no