Security readout for executives and security teams
Plain-English summary
This flaw lets an unauthenticated attacker read files Alfresco should keep private. The main business risk is disclosure of configuration data, secrets, or internal application details that could support later compromise. The provided sources rate it high severity and do not show confirmed active exploitation.
Executive priority
Prioritize this as a high-severity confidentiality issue for any internet-facing Alfresco deployment. It may expose sensitive configuration data without credentials, creating follow-on risk even if the bug does not directly modify systems or disrupt service.
Technical view
CVE-2026-26336 is a CWE-863 improper authorization issue in Hyland Alfresco. Requests to the /share/page/resource/ endpoint can expose arbitrary files from protected directories such as WEB-INF. CVSS 4.0 is 8.7: network exploitable, low complexity, no privileges, no user interaction, with high confidentiality impact only.
Likely exposure
Exposure is most likely where affected Alfresco Enterprise or Community versions are reachable by untrusted users, especially internet-facing Share interfaces. The source bundle lists Alfresco Enterprise 7.4.0, 23.6.0, 25.1.0, and Alfresco Community version 0; confirm exact deployed versions against Hyland guidance.
Exploitation context
The bundle does not cite CISA KEV listing or confirmed active exploitation. The vulnerability is remotely reachable without authentication and has low attack complexity, so public exposure should be treated as urgent even without exploitation evidence.
Researcher notes
Evidence supports improper authorization and arbitrary file read from protected directories through Alfresco Share. Impact is confidentiality-focused. The bundle identifies a vendor advisory tagged as patch, but does not provide fixed version details here; use Hyland's advisory as the authoritative remediation source.
Mitigation direction
- Review Hyland's vendor advisory for patched versions or official remediation steps.
- Upgrade or apply Hyland-provided fixes where affected versions are confirmed.
- Restrict untrusted access to Alfresco Share until remediation is complete.
- Rotate exposed secrets if protected configuration files may have been read.
- Monitor Alfresco access logs for suspicious resource endpoint requests.
Validation and detection
- Inventory all Alfresco Enterprise and Community deployments and exposed Share interfaces.
- Confirm deployed versions against the affected versions in the CVE record.
- Check whether /share/page/resource/ is reachable from untrusted networks.
- Review logs for unauthenticated access patterns targeting protected application resources.
- Verify remediation using vendor-supported checks, not offensive proof-of-concept testing.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-863: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-26336 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.7 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N——VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N3.93.6VulnCheckVulnerability scoring details
Base CVSS 4.0 score
8.7HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://connect.hyland.com/t5/alfresco-blog/cve-2026-26336-unauthenticated-arbitrary-file-read-in-alfresco/ba-p/496550CVE reference, VulnCheck · vendor-advisory, patch
- https://www.hyland.com/en/solutions/products/alfresco-platformCVE reference, VulnCheck · product
- https://www.vulncheck.com/advisories/hyland-alfresco-improper-authorization-arbitrary-file-readCVE reference, VulnCheck · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Incorrect Authorization
Incorrect Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.