How severe is CVE-2026-21449?

No CVSS score has been assigned to CVE-2026-21449 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2026-21449?

CVE-2026-21449 affects the following packages: bagisto/bagisto (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2026-21449?

Update bagisto/bagisto to 2.3.10 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-21449 is resolved across your whole dependency graph.

How do I detect CVE-2026-21449 in my Packagist dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for bagisto/bagisto, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-21449 if there is no patch (or I can't update yet)?

Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.

Is CVE-2026-21449 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-21449 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-21449?

CVE-2026-21449 has an EPSS (Exploit Prediction Scoring System) score of 0.5%, placing it in the 43th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-21449?

CVE-2026-21449 is classified as CWE-1336 (CWE-1336). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2026-21449 published, and has it been updated?

CVE-2026-21449 was published on January 2, 2026 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘 Packagist

Not in CISA KEV

CVE-2026-21449 — bagisto

Fix: bagisto/bagisto@4144931

CVE-2026-21449 is a CWE-1336 vulnerability in bagisto/bagisto. A fix is available for bagisto/bagisto — see the affected versions and patch details below.

Bagisto has SSTI via first and last name from low-privilege user (not admin)

Also known asGHSA-mqhg-v22x-pqj8

Published

Jan 2, 2026

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
A successful exploit gives an attacker total control of the affected component, not partial access.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-21449.

EPSS Exploitation Probability

via FIRST.org ↗

0.5%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs43th percentile — riskier than 43% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

🐘bagisto/bagisto

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Summary

SSTI is possible via first name and last name parameters provided by lowest-privileged users.

Details

Go to http://127.0.0.1:8000/ and login or signup
Go to http://127.0.0.1:8000/customer/account/profile
Now edit the first name and last name to {{7*7}}
Notice it appears as 49

POC

Video attached with the report: https://github.com/user-attachments/assets/f93932b5-2a57-4f34-897e-4151a5168912

Impact

This can lead to RCE, command injection.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`bagisto/bagisto`	all versions	2.3.10`composer require bagisto/bagisto:^2.3.10`

Affected Products

1 product · 1 configurations

Application

bagistowebkul

< 2.3.10

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for bagisto/bagisto, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update bagisto/bagisto to 2.3.10 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-21449 is resolved across your whole dependency graph.
Workarounds
Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.

Frequently Asked Questions

### Summary SSTI is possible via first name and last name parameters provided by lowest-privileged users. ### Details 1. Go to `http://127.0.0.1:8000/` and login or signup 2. Go to `http://127.0.0.1:8000/customer/account/profile` 3. Now edit the first name and last name to {{7*7}} 4. Notice it appears as 49 ### POC - Video attached with the report: https://github.com/user-attachments/assets/f93932b5-2a57-4f34-897e-4151a5168912 ### Impact This can lead to RCE, command injection.

O3 Security · Impact-Aware SCA

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