CVE-2026-55897

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.7%, top 51% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

luci-app-advanced-reboot is a LuCI (web interface) application for OpenWrt that provides a way to reboot your router into an alternative firmware partition or perform reboot operations directly from the web UI. Prior to 1.1.2-6, the luci-app-advanced-reboot read ACL in applications/luci-app-advanced-reboot/root/usr/share/rpcd/acl.d/luci-app-advanced-reboot.json grants rpcd file.exec permission for the general shell interpreter /bin/sh. An authenticated delegated session with that read ACL can supply caller-controlled params; rpcd authorizes the executable path and passes those arguments to the shell, allowing arbitrary commands to execute as root. Builds without the /bin/sh exec grant, including the checked openwrt-24.10 and openwrt-23.05 branches, are not affected by this specific chain. This vulnerability is fixed in 1.1.2-6.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
49%
KEV
Not listed

Published

September 21, 2026

Last Modified

September 24, 2026

Advisory Details (4)

Auto-updated Sep 21, 2026
🔬 Proof of concept available. Patch available. Sources: github_pr, github_commit, github.
github_commit

commit f85102548ee8 (openwrt/luci)

Fix landed in openwrt/luci commit f85102548ee8 — awaiting tagged release

https://github.com/openwrt/luci/commit/f85102548ee8325bfd581a0327b210b5f7670829
github_commit

commit 2df00deb1220 (openwrt/luci)

Fix landed in openwrt/luci commit 2df00deb1220 — awaiting tagged release

https://github.com/openwrt/luci/commit/2df00deb122093cbf429266ffef7ad06aaecb48f
github_pr

luci-app-advanced-reboot: update to 1.1.2-6

Fix merged in openwrt/luci PR #8710 on 2026-06-16 — awaiting tagged release

https://github.com/openwrt/luci/pull/8710
github Patch Available🟡 PoC Available

luci-app-advanced-reboot read ACL exposes /bin/sh through file.exec, allowing delegated users to run commands as root · Advisory · openwrt/luci · GitHub

https://github.com/openwrt/luci/security/advisories/GHSA-vj96-f37g-37f6

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 8× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-24 21:38 UTCEG score recompute
  2. 2026-09-24 14:04 UTCEPSS rescore
  3. 2026-09-24 00:35 UTCEG score recompute
  4. 2026-09-23 17:54 UTCEPSS rescore
  5. 2026-09-22 22:59 UTCEG score recompute
  6. 2026-09-21 20:18 UTCEG score recompute
  7. 2026-09-21 19:40 UTCEG score recompute
  8. 2026-09-21 19:40 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-55897?
CVE-2026-55897 is a high vulnerability published on September 21, 2026. luci-app-advanced-reboot is a LuCI (web interface) application for OpenWrt that provides a way to reboot your router into an alternative firmware partition or perform reboot operations directly from the web UI. Prior to 1.1.2-6, the luci-app-advanced-reboot read ACL in…
When was CVE-2026-55897 disclosed?
CVE-2026-55897 was first published in the National Vulnerability Database on September 21, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55897 actively exploited?
CVE-2026-55897 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 51.1% of all scored CVEs.
What is the CVSS score of CVE-2026-55897?
CVE-2026-55897 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-55897?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55897, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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