diff --git a/cc-ci-plan/upstream/mattermost-lts.md b/cc-ci-plan/upstream/mattermost-lts.md
index 416d0db..4484da2 100644
--- a/cc-ci-plan/upstream/mattermost-lts.md
+++ b/cc-ci-plan/upstream/mattermost-lts.md
@@ -6,6 +6,23 @@
 | postgres | postgres                                  | https://github.com/postgres/postgres              | https://www.postgresql.org/docs/release/                          |
 
 ## Standing notes
+  - **2026-09-18 re-check** (Mattermost release-policy docs; GitHub release; Docker Hub; vendor
+    security feed): **11.7 ESR line UNCHANGED** — newest patch **11.7.11** (released 2026-09-15,
+    "Low to High severity level security fixes"; Docker Hub tag pushed 2026-09-15). v10.11 ESR
+    remains EXPIRED (2026-08-15); 10.11.24 sits on the dead line — do NOT target. This run
+    extended open PR #2 **11.7.10 → 11.7.11** (branch tip 5696f0b4). Direct `--chaos` deploy on
+    cc-ci exercised the full operator path (deploy at 10.11.22 → seed admin user via API →
+    upgrade to 11.7.11): schema migrations ran on boot, **seeded user data survived** (same
+    id/roles, login 200), ping 200 with x-version-id 11.7.11; `!testme` **GREEN**, drone 1373
+    (level 5: install/upgrade/backup/restore/custom all pass, clean teardown). Vendor feed: **6
+    server advisories fixed in 11.7.11** (MMSA-2026-00711 Low; -00761/-00763/-00764/-00765/-00773
+    Medium, all affecting 11.7.x <= 11.7.10; CVE ids pending 30-day disclosure, due 2026-10-15).
+    **CVE-2026-13426 re-adjudicated FIXED** for the 10.11.22 → 11.7.11 window (fresh GitHub
+    compare: fix commit 3321db82 is an ancestor of v11.7.11 — ahead/behind 0 — and diverged from
+    v10.11.22) → window CVE count **14** (13 deterministic + 1 adjudicated). postgres **15-alpine
+    HELD** (DB-major out of scope). Gotchas learned: `abra app new` RESETS the recipe checkout to
+    main (re-checkout the branch before a `--chaos` deploy), and `abra app new --domain` does NOT
+    write DOMAIN into the app .env (edit the .env + redeploy to fix traefik routing).
   - **2026-09-11 re-check** (Mattermost Server Releases docs; endoflife.date/api/mattermost.json;
     GitHub releases + module tags): **11.7 ESR line UNCHANGED** — newest patch still **11.7.10**
     (2026-08-26; no 11.7.11; v11.11.0 is still a GitHub **prerelease**, innovation). **10.11 ESR