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CVE-2026-48939

From Exploited flaws, HARD’s guide to the flaws being used in attacks · Checked
This article is about a flaw in iCagenda. For every flaw being used in attacks, see Exploited flaws.

CVE-2026-48939 is a security flaw in iCagenda. Attackers can upload a file to iCagenda and make it run. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 10 Jul 2026.[1]

iCagenda 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. iCagenda has published a fix or advice.

Description

CISA calls it an unrestricted upload of file with dangerous type in iCagenda iCagenda. In its words: “iCagenda contains an unrestricted upload of file with dangerous type vulnerability that allows the upload of arbitrary files in the file attachment feature, ultimately resulting in PHP code upload and execution.”[1]

The underlying weakness is unrestricted file upload (CWE-434), in MITRE’s list of common software weaknesses.[2]

It scores 9.8 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; iCagenda’s advisory has them[3]. CISA names the product as iCagenda iCagenda.

Most families won’t have iCagenda; it’s for whoever looks after IT at work.

Exploitation

CISA added it to its catalog of known exploited vulnerabilities on 10 Jul 2026, 20 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 13 Jul 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 20%. That’s in the top 3% of the flaws it scores.[4]

CISA assesses it as automatable: attackers can run it against many targets at once.

CISA doesn’t say who was attacked, or how.

Fix

iCagenda 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]

  1. Check whether you use it.iCagenda 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.
  2. Send this page to your IT person.Ask them to confirm it’s fixed, or not in use. CISA gave US government agencies until 13 Jul 2026 to fix it.
  3. 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

DateEvent
The flaw is made public in the National Vulnerability Database, with a severity score of 9.8.[2]
CISA adds it to its catalog of flaws known to be used in attacks.[1]
CISA’s deadline for US government agencies to fix it.[1]
FIRST puts the odds of it being used in attacks in the next 30 days at 20%.[4]

See also

Other unrestricted file upload flaws

  • CVE-2026-48356, Adobe Commerce and Magento: unrestricted upload of file with dangerous type ·
  • CVE-2026-56291, Balbooa Forms: 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-2026-56291, Balbooa Forms: unrestricted upload of file with dangerous type ·

References

  1. ^ Cybersecurity and Infrastructure Security Agency. “iCagenda Unrestricted Upload of File with Dangerous Type Vulnerability”. Known Exploited Vulnerabilities Catalog, added 10 Jul 2026.
  2. ^ National Institute of Standards and Technology. “CVE-2026-48939 Detail”. National Vulnerability Database, published 20 Jun 2026.
  3. ^ iCagenda. Advisories and fixes: icagenda.com, icagenda.com, icagenda.com.
  4. ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.201, percentile 97.4, 31 Oct 2026.
  5. CVE Program. “CVE-2026-48939”. 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.