# CVE-2026-2812: Improper Authentication issue in ArcGIS Server

> An unauthenticated attacker can disrupt the web interface of ArcGIS Server by exploiting an improper authentication flaw in an undocumented administrative endpoint.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 May 2026
- **Updated:** 20 May 2026
- **Also known as:** GHSA-3wjj-6pp2-788h

## What is CVE-2026-2812?

CVE-2026-2812 is a medium-severity authentication bypass vulnerability in Esri Arcgis Server, published on 20 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

ArcGIS Server contains an improper authentication vulnerability in an undocumented administrative endpoint. An unauthenticated attacker could exploit this issue by sending a crafted request to the endpoint. Successful exploitation may result in disruption of the web-based browsing interface. This issue affects ArcGIS Server 12.0 and earlier.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2026-2812?

It affects 1 product.


Products: Esri Arcgis Server.

## How do I fix CVE-2026-2812?

No fix has been published for CVE-2026-2812 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-2812 being exploited?

There is no known exploitation of CVE-2026-2812 in the wild and no public exploit code.

## Other vulnerabilities in Esri Arcgis Server

- [CVE-2025-57870](https://insights.sbomify.com/CVE-2025-57870/): BUG-000179884 - There is a security vulnerability in ArcGIS Server Feature Services. (critical 10.0)
- [CVE-2026-9181](https://insights.sbomify.com/CVE-2026-9181/): Directory Traversal in ArcGIS Server (critical 9.8)
- [CVE-2026-9182](https://insights.sbomify.com/CVE-2026-9182/): Unvalidated File Upload vulnerability in ArcGIS Server. (critical 9.8)
- [CVE-2020-35712](https://insights.sbomify.com/CVE-2020-35712/): Server-side request forgery in n/a (critical 9.8)
- [CVE-2021-29102](https://insights.sbomify.com/CVE-2021-29102/): There is a Server-Side Request Forgery (SSRF) vulnerability in Esri ArcGIS Server Manager version 10.8.1 and below. (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-2812 and fix it if it is affected.

What it is: CVE-2026-2812 is a medium-severity authentication bypass vulnerability in Esri Arcgis Server, published on 20 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-2812 in the wild and no public exploit code.

Affected product: Esri Arcgis Server. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-2812/ (Markdown: https://insights.sbomify.com/CVE-2026-2812/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-2812
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-2812
- OSV: https://osv.dev/vulnerability/CVE-2026-2812

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-2812/
Summaries are generated and may contain mistakes; the official description above is the record.