# CVE-2026-82957: hyperledger-firefly Webhook Subscription webhooks.go ValidateOptions server-side request forgery

> Remote attackers can exploit a server-side request forgery vulnerability in Hyperledger FireFly's webhook subscription validation to access internal resources.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 31 Aug 2026
- **Updated:** 1 Sep 2026
- **Also known as:** GHSA-wq27-c6xr-6c38

## What is CVE-2026-82957?

CVE-2026-82957 is a medium-severity server-side request forgery vulnerability in hyperledger-firefly firefly, published on 31 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability was found in hyperledger-firefly firefly up to 1.4.0. The impacted element is the function ValidateOptions of the file internal/events/webhooks/webhooks.go of the component Webhook Subscription. Performing a manipulation of the argument url results in server-side request forgery. Remote exploitation of the attack is possible. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2026-82957?


## How do I fix CVE-2026-82957?

No fix has been published for CVE-2026-82957 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-82957 being exploited?

There is no known exploitation of CVE-2026-82957 in the wild and no public exploit code.

Public exploit code:

- SSRF in Hyperledger FireFly Webhook Subscriptions (CVE-2026-82957) (github_poc): https://github.com/hakaioffsec/CVE-2026-82957

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-82957 and fix it if it is affected.

What it is: CVE-2026-82957 is a medium-severity server-side request forgery vulnerability in hyperledger-firefly firefly, published on 31 Aug 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-2026-82957 in the wild and no public exploit code.

Affected product: hyperledger-firefly firefly. 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-2026-82957/ (Markdown: https://insights.sbomify.com/CVE-2026-82957/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-82957
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-82957
- OSV: https://osv.dev/vulnerability/CVE-2026-82957

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-82957/
Summaries are generated and may contain mistakes; the official description above is the record.