# CVE-2026-82957 — hyperledger-firefly firefly

> As of 2026-09-01, CVE-2026-82957 is a HIGH-severity vulnerability in hyperledger-firefly firefly, CVSS v3.1 7.3, EPSS 0.3% (30.4th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-82957 as of 2026-09-01; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-01

## What is CVE-2026-82957?

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.

The record classifies CVE-2026-82957 under weakness class [CWE-918](https://intel.threadlinqs.com/cwe/CWE-918). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 35 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.3 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R`)
- **CVSS v4.0 base score:** 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`)
- **EPSS (FIRST):** 0.3% probability of exploitation in the next 30 days, higher than 30.4% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-31, last modified 2026-09-01

## Is CVE-2026-82957 being exploited?

It currently carries a trending score of 37 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **hyperledger-firefly**: firefly

## How to fix CVE-2026-82957

No vendor patch reference has been recorded for CVE-2026-82957 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-82957

No threat campaign in the Threadlinqs corpus currently references CVE-2026-82957, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on 2026-09-01.

**Technical analysis**

- [vuldb.com — vdb entry](https://vuldb.com/vuln/397306)

**Third-party advisory**

- [vuldb.com — signature](https://vuldb.com/vuln/397306/cti)
- [vuldb.com — third party advisory](https://vuldb.com/cve/CVE-2026-82957)
- [vuldb.com — third party advisory (879847)](https://vuldb.com/submit/879847)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-82957
Full detection coverage and IOCs for threats exploiting CVE-2026-82957 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp