# Apache Tomcat vulnerable to Unprotected Transport of Credentials

Advisory record · `GHSA-2c9m-w27f-53rm`

- **Identifiers:** `GHSA-2c9m-w27f-53rm` · `BIT-tomcat-2023-28708` · `CVE-2023-28708`
- **State:** Confirmed
- **Severity:** CVSS 4.3 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-523](https://cwe.mitre.org/data/definitions/523.html)
- **Tags:** [CWE-523](https://agentprime.io/advisories/tag/cwe-523.md)
- **Published:** 22 Mar 2023
- **Updated:** 24 Mar 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 22 Mar 2023, 12:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `org.apache.tomcat:tomcat-catalina` (Maven): affected `>=11.0.0-M1, <11.0.0-M3 || >=10.1.0-M1, <10.1.6 || >=9.0.0-M1, <9.0.72 || >=8.5.0, <8.5.86`; fixed in `11.0.0-M3`, `10.1.6`, `9.0.72`, `8.5.86`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Apache Tomcat (tomcat-catalina) versions 11.0.0-M1 to 11.0.0-M2, 10.1.0-M1 to 10.1.5, 9.0.0-M1 to 9.0.71, and 8.5.0 to 8.5.85 are affected when the RemoteIpFilter handles requests from a reverse proxy over HTTP that set X-Forwarded-Proto to https. In these cases, session cookies lack the secure attribute, so a browser may send the session cookie over an insecure connection, where an attacker who can observe network traffic could capture it. Upgrade to 11.0.0-M3, 10.1.6, 9.0.72, 8.5.86 or later.

Written 3 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 4.3 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** 0.018, the 78th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:20 UTC: First seen by agentprime
- 31 Oct 2026, 14:20 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-2c9m-w27f-53rm)

## Sources

- [GitHub Advisory Database: GHSA-2c9m-w27f-53rm](https://github.com/advisories/GHSA-2c9m-w27f-53rm)
- [OSV: GHSA-2c9m-w27f-53rm](https://osv.dev/vulnerability/GHSA-2c9m-w27f-53rm)
- <https://nvd.nist.gov/vuln/detail/CVE-2023-28708>
- <https://github.com/apache/tomcat/commit/3b51230764da595bb19e8d0962dd8c69ab40dfab>
- <https://github.com/apache/tomcat/commit/5b72c94e8b2c4ada63a1d91dc527bf4d8fd1f510>
- <https://github.com/apache/tomcat/commit/c64d496dda1560b5df113be55fbfaefec349b50f>
- <https://github.com/apache/tomcat/commit/f509bbf31fc00abe3d9f25ebfabca5e05173da5b>
- <https://bz.apache.org/bugzilla/show_bug.cgi?id=66471>
- <https://github.com/apache/tomcat>
- <https://lists.apache.org/thread/hdksc59z3s7tm39x0pp33mtwdrt8qr67>
- <https://security.netapp.com/advisory/ntap-20230331-0012>
- <https://tomcat.apache.org/security-10.html>
- <https://tomcat.apache.org/security-11.html>
- <https://tomcat.apache.org/security-8.html>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-2c9m-w27f-53rm>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-2c9m-w27f-53rm/>. Everything for agents: <https://agentprime.io/llms.txt>.