# CVE-2026-4587: HybridAuth SSL Curl.php certificate validation

> HybridAuth library fails to properly validate SSL certificates, allowing attackers to bypass security checks and potentially intercept authentication data.

- **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Mar 2026
- **Updated:** 23 Mar 2026
- **Also known as:** GHSA-r3hf-q3mf-7h6w

## What is CVE-2026-4587?

CVE-2026-4587 is a medium-severity vulnerability in HybridAuth, published on 23 Mar 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 HybridAuth up to 3.12.2. This issue affects some unknown processing of the file src/HttpClient/Curl.php of the component SSL Handler. The manipulation of the argument curlOptions results in improper certificate validation. The attack can be launched remotely. This attack is characterized by high complexity. The exploitability is assessed as difficult. The project was informed of the problem early through an issue report but has not responded yet.

Weakness: CWE-295 (Improper Certificate Validation), CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2026-4587?

2 open source packages ship an affected version, including hybridauth/hybridauth.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `hybridauth/hybridauth` | Packagist | All versions to 3.12.2 | None |
| `hybridauth/hybridauth` | Packagist | All versions to 3.12.2 | None |

## How do I fix CVE-2026-4587?

No fix has been published for CVE-2026-4587 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4587 being exploited?

There is no known exploitation of CVE-2026-4587 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4587 and fix it if it is affected.

What it is: CVE-2026-4587 is a medium-severity vulnerability in HybridAuth, published on 23 Mar 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-2026-4587 in the wild and no public exploit code.

Affected packages and fixed versions:
- hybridauth/hybridauth (Packagist): affected all versions up to 3.12.2; no fix listed
- hybridauth/hybridauth (Packagist): affected all versions up to 3.12.2; no fix listed

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-2026-4587/ (Markdown: https://insights.sbomify.com/CVE-2026-4587/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4587
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4587
- OSV: https://osv.dev/vulnerability/CVE-2026-4587

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-4587/
Summaries are generated and may contain mistakes; the official description above is the record.