CVE-2026-48356
CVE-2026-48356 is a security flaw in Adobe Commerce and Magento, software for running online shops. A booby-trapped web page can run an attacker's code through Adobe Commerce and Magento. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 27 Oct 2026.[1]
Adobe Commerce and Magento is business software or equipment. Most families won’t have it, but attackers break into it to get inside companies, and from there to what those companies hold about their customers, patients and staff. Adobe has published a fix or advice.
Description
CISA calls it an unrestricted upload of file with dangerous type in Adobe Commerce and Magento. In its words: “Adobe Commerce and Magento contain an unrestricted upload of file with dangerous type vulnerability that could result in arbitrary code execution in the context of the current user, potentially gaining elevated access or control over the victim's account or session.”[1]
The CVE record adds: “Adobe Commerce is affected by an Unrestricted Upload of File with Dangerous Type vulnerability that could result in arbitrary code execution in the context of the current user, potentially gaining elevated access or control over the victim's account or session. Exploitation of this issue requires user interaction in that a victim must visit a maliciously crafted URL or interact with a compromised web page. Scope is changed.”[2]
The underlying weakness is unrestricted file upload (CWE-434), in MITRE’s list of common software weaknesses.
It scores 9.3 out of 10 on the Common Vulnerability Scoring System, which rates it critical, scored by NVD using CVSS 3.1.[2]
Affected versions
NVD’s record doesn’t list version ranges for it; Adobe’s advisory has them[3]. CISA names the product as Adobe Commerce and Magento.
Most families won’t have Adobe Commerce and Magento; it’s for whoever looks after IT at work.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 27 Oct 2026, 105 days after it was made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 10 Nov 2026 to fix it.[1]
FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 45%. That’s in the top 2% of the flaws it scores.[4]
CISA assesses it as not automatable: each attack takes some work.
CISA doesn’t say who was attacked, or how.
Fix
Adobe has published a fix or advice.[3] CISA’s required action: “Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes).”[1]
- Check whether you use it.Adobe Commerce and Magento is business software or equipment, so most families won’t have it. If you run a business, or work from home on company equipment, ask whoever looks after your IT.
- Send this page to your IT person.Ask them to confirm it’s fixed, or not in use. CISA gave US government agencies until 10 Nov 2026 to fix it.
- If it can’t be fixed, take it offline.CISA’s advice when there’s no fix is to stop using the product, or take it off the internet, until there is one.
You can’t fix someone else’s server, but you can watch for what follows a break-in like this: a breach notice, a password reset you didn’t ask for, or a scam message that knows things it shouldn’t. HARD watches for those for you and your family.
Timeline
| Date | Event |
|---|---|
| The flaw is made public in the National Vulnerability Database, with a severity score of 9.3.[2] | |
| CISA adds it to its catalog of flaws known to be used in attacks.[1] | |
| FIRST puts the odds of it being used in attacks in the next 30 days at 45%.[4] | |
| CISA’s deadline for US government agencies to fix it.[1] |
See also
Other Adobe Commerce and Magento flaws
- CVE-2026-71362: incorrect authorization ·
- CVE-2026-75650: improper neutralization of special elements used in a template engine ·
Other Adobe flaws
- CVE-2026-48282, Adobe ColdFusion: path traversal ·
- CVE-2009-3459, Adobe Acrobat and Reader: heap-based buffer overflow ·
- CVE-2026-34621, Adobe Acrobat and Reader: prototype pollution ·
- CVE-2020-9715, Adobe Acrobat: use-after-free ·
- CVE-2025-54236, Adobe Commerce and Magento: improper input validation ·
Other unrestricted file upload flaws
- CVE-2026-56291, Balbooa Forms: unrestricted upload of file with dangerous type ·
- CVE-2026-48939, iCagenda: unrestricted upload of file with dangerous type ·
- CVE-2026-48908, JoomShaper SP Page Builder: unrestricted upload of file with dangerous type ·
- CVE-2024-7694, TeamT5 ThreatSonar Anti-Ransomware: unrestricted upload of file with dangerous type ·
- CVE-2025-52691, SmarterTools SmarterMail: unrestricted upload of file with dangerous type ·
Added the same day
- CVE-2026-111497, Google Brotli: unchecked return value ·
Every Adobe flaw on CISA’s list · Everything added in October 2026
References
- ^ Cybersecurity and Infrastructure Security Agency. “Adobe Commerce and Magento Unrestricted Upload of File with Dangerous Type Vulnerability”. Known Exploited Vulnerabilities Catalog, added 27 Oct 2026.
- ^ National Institute of Standards and Technology. “CVE-2026-48356 Detail”. National Vulnerability Database, published 14 Jul 2026.
- ^ Adobe. Advisories and fixes: adobe.com, helpx.adobe.com.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.446, percentile 98.8, 31 Oct 2026.
- CVE Program. “CVE-2026-48356”. The official CVE record.
This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.